Gokigen Puzzles - Japanese Puzzle Book For Adults: 100 Fun And Brainy Logic Puzzle Games With Solutions: Mixed Grids - Easy

Gokigen is a logical puzzle played on a rectangular grid with numbers in circles appearing at some of the intersections on the grid. The objective is to draw exactly one diagonal line in each cell of the grid so that the number in each circle equals the number of lines extending from that circle. The lines must not form a closed loop.